OFFSET
1,2
REFERENCES
Eric S. Rowland, A simple prime-generating recurrence, Abstracts Amer. Math. Soc., 29 (No. 1, 2008), p. 50 (Abstract 1035-11-986).
LINKS
Reinhard Zumkeller, Table of n, a(n) for n = 1..10000
Eric S. Rowland, A natural prime-generating recurrence, arXiv:0710.3217 [math.NT], 2007-2008.
FORMULA
a(n) = A132199(n), n>2. [R. J. Mathar, Dec 13 2008]
MATHEMATICA
b[1] = 5; b[n_] := b[n] = b[n-1] + GCD[n, b[n-1]];
Array[b, 104] // Differences (* Jean-François Alcover, Oct 01 2018 *)
PROG
(Haskell)
a134743 n = a134743_list !! (n-1)
a134743_list = zipWith (-) (tail a134736_list) a134736_list
-- Reinhard Zumkeller, Nov 15 2013
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jan 28 2008
STATUS
approved